Becky & Kumar,
Considering these fixups, would it be advisable for the dma functions
to climb up the dev->parent linkage when dma_ops are NULL?
g.
On Sat, Apr 4, 2009 at 12:33 PM, Anton Vorontsov
<avorontsov@xxxxxxxxxxxxx> wrote:
> The driver should pass a device that specifies internal DMA ops, but
> substream->pcm is just a logical device, and thus doesn't have arch-
> specific dma callbacks, therefore following bug appears:
>
> Freescale Synchronous Serial Interface (SSI) ASoC Driver
> ------------[ cut here ]------------
> kernel BUG at arch/powerpc/include/asm/dma-mapping.h:237!
> Oops: Exception in kernel mode, sig: 5 [#1]
> ...
> NIP [c02259c4] snd_malloc_dev_pages+0x58/0xac
> LR [c0225c74] snd_dma_alloc_pages+0xf8/0x108
> Call Trace:
> [df02bde0] [df02be2c] 0xdf02be2c (unreliable)
> [df02bdf0] [c0225c74] snd_dma_alloc_pages+0xf8/0x108
> [df02be10] [c023a100] fsl_dma_new+0x68/0x124
> [df02be20] [c02342ac] soc_new_pcm+0x1bc/0x234
> [df02bea0] [c02343dc] snd_soc_new_pcms+0xb8/0x148
> [df02bed0] [c023824c] cs4270_probe+0x34/0x124
> [df02bef0] [c0232fe8] snd_soc_instantiate_card+0x1a4/0x2f4
> [df02bf20] [c0233164] snd_soc_instantiate_cards+0x2c/0x68
> [df02bf30] [c0234704] snd_soc_register_platform+0x60/0x80
> [df02bf50] [c03d5664] fsl_soc_platform_init+0x18/0x28
> ...
>
> This patch fixes the issue by using card's device instead.
>
> Signed-off-by: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
> ---
> sound/soc/fsl/fsl_dma.c | 12 ++++++------
> 1 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/sound/soc/fsl/fsl_dma.c b/sound/soc/fsl/fsl_dma.c
> index b3eb857..835e43c 100644
> --- a/sound/soc/fsl/fsl_dma.c
> +++ b/sound/soc/fsl/fsl_dma.c
> @@ -300,7 +300,7 @@ static int fsl_dma_new(struct snd_card *card, struct snd_soc_dai *dai,
> if (!card->dev->coherent_dma_mask)
> card->dev->coherent_dma_mask = fsl_dma_dmamask;
>
> - ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev,
> + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
> fsl_dma_hardware.buffer_bytes_max,
> &pcm->streams[0].substream->dma_buffer);
> if (ret) {
> @@ -310,7 +310,7 @@ static int fsl_dma_new(struct snd_card *card, struct snd_soc_dai *dai,
> return -ENOMEM;
> }
>
> - ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev,
> + ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
> fsl_dma_hardware.buffer_bytes_max,
> &pcm->streams[1].substream->dma_buffer);
> if (ret) {
> @@ -418,7 +418,7 @@ static int fsl_dma_open(struct snd_pcm_substream *substream)
> return -EBUSY;
> }
>
> - dma_private = dma_alloc_coherent(substream->pcm->dev,
> + dma_private = dma_alloc_coherent(substream->pcm->card->dev,
> sizeof(struct fsl_dma_private), &ld_buf_phys, GFP_KERNEL);
> if (!dma_private) {
> dev_err(substream->pcm->card->dev,
> @@ -445,7 +445,7 @@ static int fsl_dma_open(struct snd_pcm_substream *substream)
> dev_err(substream->pcm->card->dev,
> "can't register ISR for IRQ %u (ret=%i)\n",
> dma_private->irq, ret);
> - dma_free_coherent(substream->pcm->dev,
> + dma_free_coherent(substream->pcm->card->dev,
> sizeof(struct fsl_dma_private),
> dma_private, dma_private->ld_buf_phys);
> return ret;
> @@ -761,13 +761,13 @@ static int fsl_dma_close(struct snd_pcm_substream *substream)
> free_irq(dma_private->irq, dma_private);
>
> if (dma_private->ld_buf_phys) {
> - dma_unmap_single(substream->pcm->dev,
> + dma_unmap_single(substream->pcm->card->dev,
> dma_private->ld_buf_phys,
> sizeof(dma_private->link), DMA_TO_DEVICE);
> }
>
> /* Deallocate the fsl_dma_private structure */
> - dma_free_coherent(substream->pcm->dev,
> + dma_free_coherent(substream->pcm->card->dev,
> sizeof(struct fsl_dma_private),
> dma_private, dma_private->ld_buf_phys);
> substream->runtime->private_data = NULL;
> --
> 1.5.6.5
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@xxxxxxxxxx
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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